The vapour pressure of o-nitrophenol at any given temperature is predicted to be:

Higher than that of p-nitrophenol

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Lower than that of p-nitrophenol

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Same as that of p-nitrophenol

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Higher or lower depending upon the size of the vessel

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Solution

The correct option is A Higher than that of p-nitrophenol
In o- nitrophenol , there is intra-molecular as as well as inter-molecular hydrogen bonding while in p-nitrophenol there is only inter-molecular hydrogen bonding. Therefore, it is difficult to vaporize o-nitrophenol than p-nitrophenol . Hence the vapour pressure of o-nitrophenol is higher than that of p-nitrophenol.

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At a given temperature, osmotic pressure of a concentrated solution of asubstance.......... .
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